Improvement in ventilators and chimney-tops



1, McGOWAN. Ventilator and Chimney Tbp.

I 1 ,475; Patented March 7, 1871 a",In"'12,HIIIHIHMHIInInI I 74415719 IHUenY'OT AMns n oown To all whomtt may concern.-

Be it-knownthatI, JAMES MoGoWAmot the city, county,and Stateof N ewYorlc,

, and improved Ventilator and Chimney-Top; and I do hereby declare that the following is a full and exact fdescription thereof, reference being had to the accompanying drawing forming a part of this specification and to'tlieletters'of reference marked thereon.

uMy invention'relatcs to ventilators used upon chimneytopsfor the purpose of increasing the draught in the c'himney, and is soc'onstrncted as to prevent any ,downwarddraught. M

It co ists in a funnel-shaped cap,

h i which projects a short distance downward over the to p of thechimney,

being provided with 'cross 'a'rm ends of which saidcross-arms are hemispherical or conical fans, the months of which catch the wind and facilitate the rotary motion of the shaft in connection s at its top, at the outer tion of the cross-arms 'andconical fans, is inclosed in a suitabl'e cylinder, which forms the extreme top of thechinmey, and which isrna de to conform properly, to the spiral fan and funnel-shaped cap. 1 From actual test this ventilator is a decided im provement over any other hitherto used To enable others skilled mas art to make and myflinwention' I will use p oceed more particularly to describe the same. i j i The figure represents la longitudinalsectional clevation, showing the interior construction and arrangement of my invention. p i A: represents theouter' cylinder or casing,;which incloses the funnel-shaped capB and spiral fan 0. This cylinder may be made of anysuitable sheet metal, and sts atits" lower extremity on a base, a, which is to fit thelbrick or stone-work of the chimney. Towardits upper end the outeiuportion of the same is bulged so as to conform fto'rthe funnel-shaped cap- B, leaving a space between these two for the escape of the smoke, while another portion extends a short N; or New YORK, N. Y.

have invented a new in combination with a spiral fan and shaft, the shaft with the draught, the whole of which, with the 'excepfan 0, causes the same,

that tffi Letters PatentNc. 112,475, dated March 7, 1871.

i The Schedule refen-eg to in these Letters Patent and making part of the same.

extreme upper end forms the top v outlet for the smoke,

casing A, and its lower or wider end descends a short distance belowvthe top of the inner portion of the cyl inder just mentioned, for the purpose of preventing down draughts.

secured to a shaft, E, the lower 'end'of which said shalt rests on a bar or step, (Z, located at the lower end of the cylinder, while it has bearings toward its upper end, in the top of the cap B. I

This said fan 0 is for the purpose of increasing the of conical-shaped fan'srll F F, secured on the ends .of cross-arms I, which catch the wind and thus impart a rotating motion to the shaft E, and increase the effects of the spiral fan or wormO. The operation. is simple and readily nnderstoodl- The draught up the chimney, acting uponthe spiral together with the shaft E,"to rotate, which .elfect is further increased byineans of the conical or concave fans F l, by which means the draught is increasedand the escape or ascent of the smoke is facilitated, and by means ofthefnnnelby Letthe' pnrposessct forth. r

JAMES MoGOWAN.

Witnesses: r J OHN S. THORNTON,

distance upward in a straight line, as'scen at l). Its

WM. VENTZ.

, AssIeNon T0 HIMSELF AND DANIEL H. WABING," or SAME PLACE.

of the chimney or The cap B is secured to the upper portion of the I Within the cylinder A is a spiral fan or Worm '0,

draught in the chimney and facilitating the ascent of the smoke,whiclrobjectis further attained by means shaped cap B, the lower edge of which descends a.

spiral fan or worm O, and conical or concave fans F FF F, substantially as shown and described, and for 

